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test(run): pin the topo barrier with a rendezvous, not a sleep

"Did these two packages overlap" was asserted by ordering a `sleep 0.2` against
a later step, which measures the runner rather than the code. It failed in CI
on Node 22 and 24, passed on 23, and passed on every local run: `pkg-a` got
through *both* of its steps before `pkg-b`'s shell had started, so the first
two log lines were `pkg-a lint` and `pkg-a tsc`.

The step is a rendezvous now - it does not finish until every package has
reached it, bounded at ~5s so a real serialization reports instead of hanging.
Two packages that run together both stamp the log; two that are serialized
cannot, and the missing line is the failure. Nothing is read from a clock, and
the three cases run in 65ms rather than 600ms.

Verified by reverting the rule under test (`Math.max(0, findIndex)`): the case
goes red.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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